Bertrand RussellIs there any knowledge in the world which is so certain that no reasonable man could doubt it?
About This Quote
The idea that there is no knowledge in the world that is so certain that no reasonable man could doubt it is incorrect. While there may be some knowledge in the world that most reasonable people might doubt, they are not unreasonable men. The best example of this idea is the fact that we have all come to know the Earth exists in space, and it has been proven by many experiments. However, our knowledge of the Earth’s existence may not be so certain after all.
Source: The Problems Of Philosophy
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